PLUG IN COMBINATION OF DEVICES, ESPECIALLY FOR OVER VOLTAGE PROTECTION

Abstract

Plug-in combination devices especially for over voltage protection which comprises a pedestal type base and on or more plug-in modules, said modules receiving the over voltage protection elements, contact elements and mating contact elements, that are disposed in the base and in the plug-in module, and mechanical detent or snap-in elements that are effective between the respective plug-in modules and the pedestal type base. The detent or snap-in function can be cancelled out of replacing the plug-in module, It is thereby characterized that, The plug-in module comprises a support unit having an understructure. A plurality of large surface contact elements are provided on the understructure. The understructure has a trough shaped bottom side from where stop edges, stop surfaces and/or stop pins extend downward into the direction of the pedestal type base.

Full Text

Field of the Present Invention
The invention relates to plug-in combination of devices, especially for over voltage protection comprising a pedestal type base and one or more plug-in modules, said modules receiving the over voltage protection elements, as well as contact elements and mating contact elements that are disposed in the base and in the plug-in module, according to generic term of patent claim 1.
Background of the Present Invention
Over voltage protection device according to the art of the day, in many cases plug-in combination of devices consists of a base and a plug-in module is arranged.
In the base, connecting terminals for contacting of electrical conductors are arranged as well as corresponding housing for the insertion of plug-in modules is present. Moreover base elements receive which comprises one or several plug-in contacts of plug-in modules so that the required mechanical and electrical contact as well as the corresponding holding of plug-in module is given in the base.
The actual over voltage protection elements are located in the plug-in module, for ex. spark gap, varistors, gas discharger or similar ones.
In many cases the bases are formed as U-shaped bodies where in the open sides of U-shaped body of plug-in module are comprised wherein the plug-in module is seated on the connecting limbs of U-shaped parts. Moreover the base consists on its assembling side, receiving elements which enables so called rare rail fitting.
The advantage of brief illustrated function stretching between base and plug-in module consists in the fact that in the revision work or maintenance work the plug-in module can be separated without the connecting terminals opened or the corresponding equipment should be switched for voltage free. The withdrawn and separated plug-in module can then be investigated outside of the electrical setup under the help of special checking device and if necessary exchanged or replaced.

Prior Art References of the Present Invention
In view of the art of the day for example these are referred DE 36 39 533 C2, DE 295 19 313U1.DE 100 01 667 CI and DE 20 2004 006 227 Ul.
While planning of plug-in contact arrangement between base and plug-in module, one needs to take a note as a special problem, that the wave form 10/350 (is and 8/20 (is or net frequency of short circuit current is laid down for the fall in discharge by its flowing surge current.
Specially in the case of over voltage - lightning current arrestor as required in the market, partly high surge current up to 100 kA should be supplied many times by these contacts for almost free of burning and free of vear. Corresponding inspections are anchored in the product standards for over voltage protection device.
In order to control such type of large surge currents, therefore, one has to choose very large contact force between the individual contact elements. This has a consequence, that the plug-in module according to the state of the art can be separated only with the help of increased power expenditure and in most case only with the help of special tools. Hence this requires an additional tool and has a considerable disadvantage for the application of device. In addition to that it has a potential danger that exists during handling with the tool within the arrestor for unwanted tri pops of a disturbing arch and there exists a danger for the human beings as well as to the equipment.
In such case when the contact force between the contact elements is applied very less, in fact through this the separation of plug in module is simplified, however there exists a danger under the influence of electro dynamic forces during surge current process to give unwanted jumping out of the plug in module from the base, so that according to rules complete function of the device doesn't give any protective measures.
A combination of pedestal device and inserting element is already known from PCT-WO 95/12905, wherein the inserting element for example is a device for protection of over voltage. The pedestal device consists of U-like shape in the lateral view, wherein both the limbs of U-shaped sides, the connecting terminals for supply, a connecting

terminal for earthing as well as auxiliary contact terminal are provided. At the back side of pedestal type device, an arrangement for fixing the same is provided on assembly rail. The inserted element is assumed between the sides of the pedestal device and there it is fixed on both sides of inserted elements provided with detent projections which are placed behind all the detent projections in the pedestal type vessel. In addition to that in the cell connector of pedestal device spring contacts are provided, rigid contact springs are provided in the insert elements, with the pedestal type device placed with the locating insert elements.
The earlier known design for the combination of pedestal type device and insertion element is so arranged that the insert element can be exchanged without needing to demount the pedestal type device. The detent projections which according to the description of art of the day very few times a side walls of inserting elements which is turned back the internal surface of sides of pedestal type devices are provided, in fact with the counter detent at the pedestal type device it can enter in detent connection, however the holding forces are insufficient in the direct formation of detent projection on a spring type part of insert elements. The surge current appearing in lightning current discharge lead to such a high forces that even with at he locating device of plug-in module regarding the support unit there exists a danger that plug-in module may move out from support unit.
Objects of the Present Invention
The main object of the present invention is to develop a plug-in combination of devices, especially for over voltage protection.
Statement of the Present Invention
Plug-in combination devices especially for over voltage protection which comprises a pedestal type base and on or more plug-in modules, said modules receiving the over voltage protection elements, contact elements and mating contact elements, that are disposed in the base and in the plug-in module, and mechanical detent or snap-in elements that are effective between the respective plug-in modules and the pedestal type base. The detent or snap-in function can be cancelled out of replacing the plug-in module, It is thereby characterized that, The plug-in module comprises a support unit

having an understructure. A plurality of large surface contact elements are provided on the understructure. The understructure has a trough shaped bottom side from where stop edges, stop surfaces and/or stop pins extend downward into the direction of the pedestal type base.
The support unit is enclosed by a cover, the said cover having at least one hinge area on at least one side thereof. Said hinge area gradually wedges into a pressure plate and actuates a detent insert comprising detent projections or detent knobs. The detent insert shows two sides of intended slant or wedge surface, which are arranged on the link pin in the gap region between the slope area or wedge area, is provided a return. On its base an arresting edge is formed which runs essentially parallel to the linking pin.
Resulting from the arresting edges both sides of return a flexible specifying loop are located and the detent insert with linking pin and arresting edge is assumed in a gap of side parts of support unit and is fixed by cover.
Detailed Description of the Present Invention
Accordingly, the present invention relates to a plug-in combination devices especially for over voltage protection which comprises a pedestal type base and on or more plug-in modules, said modules receiving the over voltage protection elements, contact elements and mating contact elements, that are disposed in the base and in the plug-in module, and mechanical detent or snap-in elements that are, effective between the respective plug-in modules and the pedestal type base. The detent or snap-in function can be cancelled out of replacing the plug-in module, It is thereby characterized that, The plug-in module comprises a support unit having an understructure. A plurality of large surface contact elements are provided on the understructure. The understructure has a trough shaped bottom side from where stop edges, stop surfaces and/or stop pins extend downward into the direction of the pedestal type base; The support unit is enclosed by a cover, the said cover having at least one hinge area on at least one side thereof. Said hinge area gradually wedges into a pressure plate and actuates a detent insert comprising detent projections or detent knobs. The detent insert shows two sides of intended slant or wedge surface, which are arranged on the link pin in the gap region between the slope area or wedge area, is provided a return. On its base an arresting

edge is formed which runs essentially parallel to the linking pin; Resulting from the arresting edges both sides of return a flexible specifying loop are located and the detent insert with linking pin and arresting edge is assumed in a gap of side parts of support unit and is fixed by cover.
In yet another embodiment of the present invention, wherein the specifying loops, the detent insertion support for internal side of support unit.
In still another embodiment of the present invention, wherein the pressure plate gaps in the region of slope or wedge surfaces of detent insertion as well as shows at least a slide, which catches into the return of the detent insert for activation of the same. The return of detent insertion intervenes for activation of same.
In yet another embodiment of the present invention, wherein with the help of flexible specifying loops the detent insertion is maintained under pre-stressing in its position in the gap of side parts of support unit.
In yet another embodiment of the present invention, wherein between the base and plug-in module is provided a spring like mechanical energy saver which is stressed by insertion of respective plug-in module and released in the elimination of detent or snap-in-function of mechanical energy for loosening of plug-in module from pedestal type base.
In still another embodiment of the present invention, wherein the support unit receives the over voltage protection elements.
In yet another embodiment of the present invention, wherein the region of understructure of supporting unit are provided detent projections which interrupts this arresting in complimentary gaps.
In still another embodiment of the present invention, wherein the cover shows in each case broader sides and smaller sides lying opposite to each other.

In yet another embodiment of the present invention, wherein the pressure plate is provided at least one of the small sides.
In still another embodiment of the present invention, wherein the external surface of pressure plate is structured.
In yet another embodiment of the present invention, wherein the coding pin and/or an element disengaging a telecommunication contact is provided in the understructure.
In still another embodiment of the present invention, wherein the cover in the lower region shows a wedge form moving over its width.
In yet another embodiment of the present invention, wherein the cover in its upper surface shows a spherical or arc like shape.
In still another embodiment of the present invention, wherein the base posses a U-form wherein into the open arms of lower parts of detent or snap-in elements are arranged as well as the link arms of gaps for the or the spring like mechanical energy saver and comprises its activation.
In yet another embodiment of the present invention, wherein the open side piece posses longitudinally moving guiding rails for easy insertion of respective plug-in module.
In still another embodiment of the present invention, wherein the connecting side piece shows one for base of understructure, shows a complimentary for base of understructure, whereby lower portion of linking side piece housings are provided for respective spring units which comprises from top an access for the stopping edges, stopping pins or stopping surfaces of understructure.
In yet another embodiment of the present invention, wherein the respective spring units supports against the base of pedestal type base.

In still another embodiment of the present invention, wherein the link side piece at least one gap is provided for a coding pin or the access to the telecommunication contact.
In yet another embodiment of the present invention, wherein the detent or snap-in elements provided many times and preferably are arranged symmetrically.
In still another embodiment of the present invention, wherein the link side piece shows both sides in each case a formed pin which stabilizes oppositely placed open side piece parts.
In yet another embodiment of the present invention, wherein the plug-in module with the cover upper part and the pressure plates located there in plugged in condition remains open for access.
In still another embodiment of the present invention, wherein the contact elements and mating contact elements are carried out as surge current carrying plug-in contacts.
From the above therefore it is the aim of the invention is to further improvement in plug-in combination of devices, specially for protection of over voltages, comprising of a pedestal type base and to be specified for one or several plug-in modules whereby combination of devices can lead on one side of the considerable surge current free of burning and vear free, as well as on the other side the plug-in module located in the pedestal type base is fixed securely and that means special tools are avoided and can be removed without any auxiliary means.
The problem of the invention is solved by carrying out characteristic combination according to the theory of patent claim 1, whereby the sub claims contains at least appropriate designing and further developments.
Therefore the basic idea of invention consisting in the fact that a function to be assumed between the designed groups of electrical plug-in contact systems and locating device unit whereby a special separate insertion of detent is to be used.

The locating device unit with detent insertion locks the plug-in module in the required limit.
In the case if the plug-in module is to be separated, the locking device is removed through simple manual use of force at the locating device unit. In a construction design with the help of mechanical energy saving released, mechanical effect of the force then the plug-in module can be moved out from the base without considerable force.
The interpretation of above mentioned function group is variable over a large area and it can be optimized with that. In principle it is conceivable that the returning forces are to be so arranged that the plug-in module is automatically pressed out from the plug-in contact. In the same way the mechanical coordination is brought out in such a way that only with considerable force the plug-in module can be drawn out.
An essential advantage of this invention consists in the fact that the actual contact system, which means the design shaping of contact elements and mating contact elements, is optimally placed in the function with surge current discharge.
In the implementation of basic ideas according to the invention is therefore independent of forces, which holds the contact elements and mating contact elements of logical conclusion and/or with inserted plug-in module. An arrangement of special mechanical detent or snap-in-elements are undertaken which acts between the respective plug-in modules to the pedestal type base.
The detent or Snap-in-function is avoidable without mechanical help during required exchange or for controlling of plug-in module.
In a constructional features between base and plug-in module a spring like mechanical energy saver is provided, which is stressed during insertion of respective plug-in modules and released during disconnection of detent or snap-in-function of mechanical energy for loosening of plug-in modules from pedestal base.

The plug-in module consists of support unit with a base group wherein several large surface contact elements are disposed at the base group.
Moreover, the base group posses a trough shaped base from which there extends stop edges, stop surfaces and/or stop pins towards down in the direction of pedestal type base.
The support unit is enclosed by a cover whereby the cover posses sides lying opposite to each other of hinged surfaces which skips into a pressure plate on whose ends is provided the separate detent insertion parts with detent projection or detent cam which is filled in the inserted condition detent or snap-in-function with reference to the base.
The cover can be realized as synthetic material wherein the hinge surface can be a so called lamina hinge joint. The hinge surface generally stands under pre stress with pressure plate in such a way that the detent projection or detent cam of detent insertion part assumes an outside position to a maximum extent. By applying small force on the pressure plate the detent insertion part with their detent projections or detent cams can be moved in the direction of internal side of cover and from the complimentary openings which are located in the pedestal type bottom, stretched out and are released.
The above mentioned support unit accommodates the real over voltage protection elements. Below the pressure plate of cover, a surface limited by moment of the pressure plate or edge is formed on the support unit.
In the range of base groups of support unit detent projections are provided, which intervenes this locking in complimentary omissions of the cover.
The cover shows two oppositely placed broad sides and two oppositely placed small sides in which the pressure plates are located on the small sides.
The omissions of cover are arranged preferably in the lower part of broader sides.

The external surface of pressure plate is designed for easy activation of pressure plates and for bringing out the plug-in modules from bottom.
The preferred pair wise detent projections or detent cams of detent inserts parts which are provided can show a wedge shaped gliding surface or slope in which the respective wedge shaped peaks are oriented in plug-in direction. During plug-in process the wedge shaped gliding faces glides on the surface of pedestal type base along and then rests in the provided gaps under distressing of pressure plate.
At the bottom group, coded stylus and/or a telecommunicated contact disengaged element may be provided.
According to the arrangement done in the invention the cover shows in the bottom area a wedge shaped form which proceeds in its width. Moreover in this arrangement the cover posses on its upper side of a spherical or a curve like shape.
The base of combination of device possess a U-shape in which detent or snap-in-elements are arranged into the open side arms of bottom as well as the linking arms if necessary gaps for the or the spring like mechanical energy saver and consist of their activation.
Moreover, the open arms of longitudinally moving guided rails can posses for easy insertion of plug-in modules. These guided rails can possess even a coding function in order to enable a defined corrected side plugging in so that a wrong insertion of corresponding base plate can be avoided.
The connecting arms of base shows a complimentary form for base of understructure whereby lower part of the connecting sides housings can be provided for a spring unit in each case which comprises towards upper part an access for stop edges, stop pins or stop surfaces of understructure. Preferably, the respective spring units supports against the bottom of the pedestal type base plate. The springs of spring units are exchangeable so that adoptability at the respective insertion regarding pre stress force and

disconnecting force can be undertaken with uniform design concepts of base in easier way.
In connecting arms at least one gap is provided for a coding pin or an access for a telecommunication contact.
The detent or snap-in-elements as well as shaped end enables the possible mechanical energy saver are provided several times and are arranged preferably in symmetry.
The connecting arms of base shows on both sides a stem which stabilizes open sides which are placed opposite to each other without the fear of moving wide apart of these parts during insertion of plug-in modules.
The respective plug-in modules with the cover upper part and the pressure plates located there stands in plug-in condition and remains there for activation of pressure plates for the purpose of removal of plug-in module for better access.
The contact elements and mating contact elements which are located on one side in plug-in module and other side in base, are arranged as surge current carrier plug-in contacts with large contact maintaining force thereby the contact maintaining force however is not primary or simultaneously a mechanical arresting of plug-in module has to be filled in base.
The invention may be clearly explained basing on the following detailed examples as well as with the help of figures.
Brief description of the Accompanying Drawings
Fig. 1 — A three dimensional display, according to the invention, a plug-in module with covered lid (left part of the figure) as well as with the view of support unit without cover (right part of the figure)
Fig. 2 — A display of U-shaped base with detailed presentation of spring unit.

Fig,3— A display of completed plug-in combination of devices with inserted plug-in module and detailed presentation of mechanical energy saving with the completely inserted module located in pedestal part.
Fig. 4— A display of plug-in module with cover and recognizable detent insert part with slope surface or wedge surface for production of detent connection referring to the gaps in the base plate.
Fig. 5— A detailed representation of fixed detent insert parts with part wise path breaking cover and pressure plate and
Fig. 6— Various views of detent insert parts.
As it is clear from Fig. 1, the plug-in module 1 consists of support unit 4 and a cover 5.
Under the cover 5 for example the actual active components of over voltage arrester are located in support unit 4 and stands in electrical connection for the plug-in contacts 2.
The plug-in contacts 2 are arranged as large surface metallic blocks preferably at the oppositely lying sites arranged in symmetry.
On the cover 5 designed operative surfaces 6' is located on both sides of narrow sides as pressure plate 6.
This can be integrated economically into the designing of cover elements, since they are arranged moveably on the upper side by a mechanically designed hinged surface 7.
With mechanical force operation these are moved inside on the operative surface 6' whereby a stopping plate 8 of supporting unit (4) can function as path limitation.
The available path of pressure plate 6 is so adjusted that the detent projection 9 steps out from its counter part 9'. (See fig.2) so that locating device is nullified).

As shown in the detailed example two detent projections 9 are provided in each case on the front ends, so that plug-in module 1 is totally available over four fixed points and with that balanced out correspondingly and without warpage it is held in the required position.
The surface of activation surface 6' is provided with a structure so that an easy removal of plug-in module 1 is possible without excess energy.
In addition to that the base of supporting unit 4 is carried out as trough shaped bottom of understructure, a coding pin or a remote activated contact 100 is shown.
From the base of above mentioned understructure includes stopping edge, stopping surface or stopping pins 10, which acts as pressure points referring on each of the accompanying spring units 11. (Fig. 2).
The supporting unit 4 shows in the region of understructure detent projection 110, which in complimentary gaps 111 of cover 5, engages this arresting.
The detent projection 9 of detent insertion part 200(See fig. 4 to fig. 6) are carried out as slant or slide surfaces 112 whereby the respective wedge peaks are oriented in the direction of plug-in.
As one can see clearly in the presentation of figures the cover 5 is placed in the lower region which can be moved wedge shaped form whereby the upper part of the cover 5 posses a spherical or arc shaped.
Each plug-in module 1 is provided preferably with two or four symmetrically arranged plug-in contact elements 2. Through the designing of plug-in contact elements 2 as moving part or fixed part it is possible to carry out relatively large surge currents almost wear free by the large surface contact elements. The uniformly distributed on the base the arrangement of single plug-in contacts distributed uniformly on the lower side ensures a uniform homogeneous power distribution so that even with large electro

dynamic powers doesn't lead to a deformation or for edge deformation of plug-in module within the base.
The base of combination of devices possess according to the presentation of figure 2 and 3 a U-form. Here it shows the base plate 12 to open U-shaped side 120 as well as a connecting piece 121.
In the open piece 120 of bottom 12 the above mentioned gaps 9' are moulded for the detent projections 9 of detent insertion parts 200 of plug-in module 1.
The connecting piece 121 shows gaps 122 for the spring like mechanical energy saver and its activation.
The open piece 120 posses guiding rail 13 as designed in the invention for easy and correct insertion of respective plug-in module 1.
Further the connecting piece 121 shows on its upper surface a complimentary form to the lower side of understructure of plug-in module 1 wherein lower part of the connecting piece housings 123 are provided for respective spring units 11 which comprises from top an access for the stopping edges 10 of understructure of plug-in module 1.
As shown in the fig. 2 and 3 it is clear that supporting of spring units 11 which are provided in each case comprises at least one helical spring against the base of the pedestal type base.
In addition in the connecting piece 121 at least a gap 124 is provided for a code pin or as access for telecommunication contact.
For reinforcing and stabilizing of total arrangement of base, the connecting piece 121 shows both sides a pin 125.

In the plug-in condition (see fig. 3) the plug-in module 1 remains with the cover upper part and accessible to the pressure plates located there.
During the insertion of plug-in module 1 in the base plate 12 carried through guiding rail and the production of required electrical contact between corresponding plug-in contacts 2 and counter pieces in the lower part, the applied mechanical power is used for that purpose in order to pre stress the mechanical energy saver 3 or 11 located in the lower part 12.
This is realized by corresponding stop edges, stop pins or stop surfaces and pressure points provided there.
For example in each of the lower part 12 four spring units 11 are preferably integrated. The number and the symmetric positioning ensure an optimum homogeneity of power effect.
By the definite constructive design of mechanical energy saver 3 especially the selection of a suitable spring elements and their spring characteristics allows varying the employed shifting force and with linked shifting path by a wider area.
During loosening of detent projection 9 from the gaps 9' by exercising a pressure force on the pressure plate 6 or activation surface 6' the detent projection 9 comes into external contact with the gaps 9'. Consequently the plug-in module 1 by using of saved mechanical energy in the spring unit can easily be removed without additional mechanical means or tools.
The design and the way of functioning according to the invention, detent insertion parts for receiving of a special security and mechanically rigid detent connection might be explained clearly basing on the figure 4 to 6.
The detent insertion parts 200 displayed in figure 6 in two views shows front side (right side of display) to sloped or wedge surface 112 which are arranged on a connection piece 201.

In the spacing area between the slope or wedge surface 112 an offset 202 is provided, on its base arresting edge 203 are shaped, which spreads essentially parallel to the connecting pin 201.
The connecting edge shows a larger high dimensions as the connecting pin 201 in order to fix detent insertion part 200 according to the presentation figures 4 and 5 ensuring at the support unit.
Resulting from arresting edges 203 two sides of offset 202 flexible specification loops 204. The specifying loops 204 posses a angular portion resulting from back side surface (left side of the figure 6) the arresting edge 203 and a height, which is larger to the extent of slope or wedge shaped surface 112.
The detent insertion 200 is assumed with a connecting pin 201 and the arresting edge 203 in a gap 205 of support unit 4 of plug-in module 1 and fixed by the cover 5.
The specifying loop 204 supports the detent insertion part 200 for internal side of the support unit 4 which is recognizable specially from the presentation according to figure 5.
The pressure plate 6 posses in the field of slant or wedged surface 112 gaps 206 as well as at least a latch 207, which intervenes in the return 202 of detent insertion 200 for activation of the same.
With the help of flexible specifying loops 204 the detent insertion part 200 held under pre stressing, in its position in the gap of side parts of support unit 4 and fixed.
In the range of return 202 of detent insertion part 200 a re-enforcing 208 can be provided for ensuring a sufficient mechanical stability.
Preferably the detent insertion part 200 is finished single piece as synthetic material insert or pressed compact. For the case, that one of the slant or wedge surface 112 is

damaged or posses a possibility, after removal of lid 5 the detent insertion part 200 is to be substituted so that plug-in module can be further used.
Forces on the plug-in module are assumed by support unit 4 and conveyed in the range of connecting piece 201 on the detent insertion part 200 and by means of detent insertion part 200 in the supplied detent link to the gaps 9' in the removal of base.
Reference character lists-
1. Plug-in module
2. Plug-in contact
3. Mechanical energy saver.
4. Support unit.
5. Cover.
6. Pressure plate
6\ Activation surface
7. Hinge surface
8. Stop plate
9. Detent projection.
9'. Space for detent projection in base.
10. Stop edge or pressure points of this.
11. Spring unit.
12. Base.
13. Guiding rail
100. Coding ping and/or telecommunication contact.
110. Detent elements on understructure of support unit.
111. Gaps in the cover.
112. Wedge shaped sliding surfaces of detent projection.
120. Open side piece of base 12.
121. Connecting limb of base.
122. Gap as access for spring unit.
123. Housing for the spring unit.
124. Gap for coding pin and/or access for telecommunication contact.
125. Cell connector.

We Claim:
1. Plug-in combination devices especially for over voltage protection which comprises a pedestal type base and on or more plug-in modules, said modules receiving the over voltage protection elements, contact elements and mating contact elements, that are disposed in the base and in the plug-in module, and mechanical detent or snap-in elements that are effective between the respective plug-in modules and the pedestal type base. The detent or snap-in function can be cancelled out of replacing the plug-in module, It is thereby characterized that, The plug-in module comprises a support unit having an understructure. A plurality of large surface contact elements are provided on the understructure. The understructure has a trough shaped bottom side from where stop edges, stop surfaces and/or stop pins extend downward into the direction of the pedestal type base; The support unit is enclosed by a cover, the said cover having at least one hinge area on at least one side thereof. Said hinge area gradually wedges into a pressure plate and actuates a detent insert comprising detent projections or detent knobs. The detent insert shows two sides of intended slant or wedge surface, which are arranged on the link pin in the gap region between the slope area or wedge area, is provided a return. On its base an arresting edge is formed which runs essentially parallel to the linking pin; Resulting from the arresting edges both sides of return a flexible specifying loop are located and the detent insert with linking pin and arresting edge is assumed in a gap of side parts of support unit and is fixed by cover.
2. The Plug-in combination of devices as claimed in claim 1, wherein the specifying loops, the detent insertion support for internal side of support unit.
3. The Plug-in combination of devices as claimed in claim 1 or 2, wherein the pressure plate gaps in the region of slope or wedge surfaces of detent insertion as well as shows at least a slide, which catches into the return of the detent insert for activation of the same. The return of detent insertion intervenes for activation of same.

The Plug-in combination of devices as claimed in claim 1, wherein with the help of flexible specifying loops the detent insertion is maintained under pre-stressing in its position in the gap of side parts of support unit.
The Plug-in combination of devices as claimed in claim 1, wherein between the base and plug-in module is provided a spring like mechanical energy saver which is stressed by insertion of respective plug-in module and released in the elimination of detent or snap-in-function of mechanical energy for loosening of plug-in module from pedestal type base.
The Plug-in combination of devices as claimed in claim 1, wherein the support unit receives the over voltage protection elements.
The Plug-in combination of devices as claimed in claim 1, wherein the region of understructure of supporting unit are provided detent projections which interrupts this arresting in complimentary gaps.
The Plug-in combination of devices as claimed in claim 1, wherein the cover shows in each case broader sides and smaller sides lying opposite to each other.
The Plug-in combination of devices as claimed in claim 8, wherein the pressure plate is provided at least one of the small sides.
The Plug-in combination of devices as claimed in claim 1, wherein the external surface of pressure plate is structured.
The Plug-in combination of devices as claimed in claim 1, wherein the coding pin and/or an element disengaging a telecommunication contact is provided in the understructure.
The Plug-in combination of devices as claimed in claim 1, wherein the cover in the lower region shows a wedge form moving over its width.

13. The Plug-in combination of devices as claimed in claim 1, wherein the cover in its upper surface shows a spherical or arc like shape.
14. The Plug-in combination of devices as claimed in claims 5 to 13, wherein the base posses a U-form wherein into the open arms of lower parts of detent or snap-in elements are arranged as well as the link arms of gaps for the or the spring like mechanical energy saver and comprises its activation.
15. The Plug-in combination of devices as claimed in claim 14, wherein the open side piece posses longitudinally moving guiding rails for easy insertion of respective plug-in module.
16. The Plug-in combination of devices as claimed in claim 5 and 14 or 15, wherein the connecting side piece shows one for base of understructure, shows a complimentary for base of understructure, whereby lower portion of linking side piece housings are provided for respective spring units which comprises from top an access for the stopping edges, stopping pins or stopping surfaces of understructure.
17. The Plug-in combination of devices as claimed in claim 16, wherein the respective spring units supports against the base of pedestal type base.
18. The Plug-in combination of devices as claimed in claims 14 to 17, wherein the link side piece at least one gap is provided for a coding pin or the access to the telecommunication contact.
19. The Plug-in combination of devices as claimed in claim 1, wherein the detent or snap-in elements provided many times and preferably are arranged symmetrically.
20. The Plug-in combination of devices as claimed in claims 14 to 19, wherein the link side piece shows both sides in each case a formed pin which stabilizes oppositely placed open side piece parts.

21. The Plug-in combination of devices as claimed in claim 1, wherein the plug-in
module with the cover upper part and the pressure plates located there in
plugged in condition remains open for access.
22. The Plug-in combination of devices as claimed in claim 1, wherein the contact
elements and mating contact elements are carried out as surge current carrying
plug-in contacts.